diff --git a/.example/database/gdb/mysql/config.toml b/.example/database/gdb/mysql/config.toml
index db81820fe..1c51768a6 100644
--- a/.example/database/gdb/mysql/config.toml
+++ b/.example/database/gdb/mysql/config.toml
@@ -1,14 +1,5 @@
 
 # MySQL数据库配置
 [database]
-    [[database.default]]
-        host     = "127.0.0.1"
-        port     = "3306"
-        user     = "root"
-        pass     = "12345678"
-        name     = "test"
-        type     = "mysql"
-        role     = "master"
-        debug    = "true"
-        weight   = "1"
-        charset  = "utf8"
+    link = "mysql:luoling2013:m5k2s8p5@tcp(127.0.0.1:3306)/test"
+
diff --git a/database/gkvdb/gkvdb_unit_test.go b/database/gkvdb/gkvdb_unit_test.go
index 188d308ca..9a0411f74 100644
--- a/database/gkvdb/gkvdb_unit_test.go
+++ b/database/gkvdb/gkvdb_unit_test.go
@@ -25,13 +25,16 @@ import (
 
 func Test_New(t *testing.T) {
 	gtest.Case(t, func() {
-		path := "/tmp/gkvdb/" + gconv.String(gtime.Nanosecond())
+		name := gconv.String(gtime.Nanosecond())
+		path := "/tmp/gkvdb/" + name
 		key := []byte("key")
 		value := []byte("value")
 
-		db := gkvdb.Instance()
-		db.SetPath(path)
-		err := db.Set(key, value)
+		db := gkvdb.Instance(name)
+		err := db.SetPath(path)
+		gtest.Assert(err, nil)
+
+		err = db.Set(key, value)
 		gtest.Assert(err, nil)
 
 		gtest.Assert(db.Get(key), value)
@@ -42,26 +45,31 @@ func Test_New(t *testing.T) {
 
 func Test_Set(t *testing.T) {
 	gtest.Case(t, func() {
-		path := "/tmp/gkvdb/" + gconv.String(gtime.Nanosecond())
+		name := gconv.String(gtime.Nanosecond())
+		path := "/tmp/gkvdb/" + name
 		key := []byte("key")
 		value := []byte("value")
 
-		db := gkvdb.Instance()
-		db.SetPath(path)
-		err := db.Set(key, value, 100*time.Millisecond)
+		db := gkvdb.Instance(name)
+		err := db.SetPath(path)
+		gtest.Assert(err, nil)
+
+		err = db.Set(key, value, 1000*time.Millisecond)
 		gtest.Assert(err, nil)
 
 		gtest.Assert(db.Get(key), value)
-		time.Sleep(200 * time.Millisecond)
+		time.Sleep(1500 * time.Millisecond)
 		gtest.Assert(db.Get(key), nil)
 	})
 }
 
 func Test_Iterate(t *testing.T) {
 	gtest.Case(t, func() {
-		path := "/tmp/gkvdb/" + gconv.String(gtime.Nanosecond())
-		db := gkvdb.Instance()
-		db.SetPath(path)
+		name := gconv.String(gtime.Nanosecond())
+		path := "/tmp/gkvdb/" + name
+		db := gkvdb.Instance(name)
+		err := db.SetPath(path)
+		gtest.Assert(err, nil)
 
 		strArray := garray.NewSortedStringArray()
 		strArrayReverse := garray.NewSortedStringArrayComparator(func(a, b string) int {